Explosion destroys part of a residential building in Russia.

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On Monday, local authorities reported that an explosion occurred in a 5-storey residential building. The explosion occured in Naberezhnye Chelny city, 930km east of Moscow. Several people were injured in the blast. The explosion is believed to have destroyed at least two floors.
It is not yet known what caused the explosion. This is a developing story. More details to follow.